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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.canonicalDomain = canonicalDomain;
const constants_1 = require("./constants");
const node_url_1 = require("node:url");
/**
* Transforms a domain name into a canonical domain name. The canonical domain name is a domain name
* that has been trimmed, lowercased, stripped of leading dot, and optionally punycode-encoded
* ({@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.1.2 | Section 5.1.2 of RFC 6265}). For
* the most part, this function is idempotent (calling the function with the output from a previous call
* returns the same output).
*
* @remarks
* A canonicalized host name is the string generated by the following
* algorithm:
*
* 1. Convert the host name to a sequence of individual domain name
* labels.
*
* 2. Convert each label that is not a Non-Reserved LDH (NR-LDH) label,
* to an A-label (see Section 2.3.2.1 of [RFC5890] for the former
* and latter), or to a "punycode label" (a label resulting from the
* "ToASCII" conversion in Section 4 of [RFC3490]), as appropriate
* (see Section 6.3 of this specification).
*
* 3. Concatenate the resulting labels, separated by a %x2E (".")
* character.
*
* @example
* ```
* canonicalDomain('.EXAMPLE.com') === 'example.com'
* ```
*
* @param domainName - the domain name to generate the canonical domain from
* @public
*/
function canonicalDomain(domainName) {
if (domainName == null) {
return undefined;
}
let str = domainName.trim().replace(/^\./, ''); // S4.1.2.3 & S5.2.3: ignore leading .
if (constants_1.IP_V6_REGEX_OBJECT.test(str)) {
if (!str.startsWith('[')) {
str = '[' + str;
}
if (!str.endsWith(']')) {
str = str + ']';
}
return (0, node_url_1.domainToASCII)(str).slice(1, -1); // remove [ and ]
}
// convert to IDN if any non-ASCII characters
// eslint-disable-next-line no-control-regex
if (/[^\u0001-\u007f]/.test(str)) {
return (0, node_url_1.domainToASCII)(str);
}
// ASCII-only domain - not canonicalized with new URL() because it may be a malformed URL
return str.toLowerCase();
}
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